Part One
1. Hover-reveal tools reveal the contextual tools when the user pauses the mouse over an object.
2. To keep the layout clean and reduce clutter. Specific tools that target only a few things on the page.

3.
  • Activate tool overlays instantly. Unlike informational overlays, the user needs the additional tools to be available for immediate interaction.
  • Make sure revealed icons are clear and understandable. When possible, just use text labels